al-qaida operatives still plot and plan across the border in pakistan. the taliban still try to regain lost ground, still intimidate and still assassinate as we just saw this past week about the brutal killing of president karzai's brother. hamid karzai trying to climb into his brother's grave last week is facing almost daily challenges to his rule. his brother was assassinated by a trusted bodyguard. a former governor and loyal political adviser to karzai was assassinate ned his apartment by two taliban gunman wearing bomb belts. >> in crushing heat and in numbing cold from the deserts of southern afghanistan to the peaks of the behind due kush. you have shown initiative, determination, innovative necessary and courage. you have been diplomats as well as warriors, statesman as well as soldiers. your performance as been in a word awesome. >> reporter: general petraeus handed over his command to marine general john allen. petraeus will retire from the army and particular over as the head of the cia in september. >> there will be tough days ahead. and i ha